VIPER22AS-E

Overview

The VIPER22AS-E is a low-power off-line SMPS primary switcher from STMicroelectronics, integrating a dedicated current mode PWM controller with a high-voltage power MOSFET on a single silicon chip. It operates at a fixed switching frequency of 60 kHz and supports a wide VDD voltage range of 9 V to 38 V. The device features auxiliary undervoltage lockout with hysteresis and a high-voltage start-up current source. It provides comprehensive protection including overtemperature, overcurrent, and overvoltage protection with auto-restart capabilities.

Feature Summary

• Integrates a high-voltage power MOSFET with a current mode PWM controller on one chip
• Features automatic burst mode operation for improved efficiency under low load conditions
• Includes overvoltage protection operating in hiccup mode for enhanced safety
• Supports wide input voltage ranges suitable for battery charger adapter configurations

Applications

• Off-line power supplies for battery charger adapters
• Standby power supplies for televisions or monitors
• Auxiliary supplies for motor control systems

Procurement Notes

Verify the specific package variant when ordering, as the VIPER22A-E series includes SO-8 (AS), DIP-8 (DIP), and other configurations. Confirm that the required component matches the SOIC-8 surface mount package associated with the AS suffix. Ensure compliance with RoHS standards and check humidity sensitivity levels prior to assembly to prevent damage during soldering processes.

Selection Notes

Select this component for designs requiring a compact solution for low-power offline applications. The integrated nature simplifies design by combining control and switching functions. Consider the thermal performance limits and the specific packaging requirements for your PCB layout. The fixed frequency and current mode control offer predictable behavior for standard flyback topologies.

Part Context

This part belongs to the VIPerPlus family of power management ICs designed for energy-efficient offline conversion. It is categorized under AC/DC converters and PMICs. The device is manufactured using silicon technology and is intended for industrial and commercial applications requiring reliable power conversion in space-constrained environments.

Replacement Considerations

Public confirmed substitute part numbers include VIPER22ASTR-E and VIPER22ADIP-E. Verify pin compatibility and electrical specifications before substitution.